电极生物膜法反硝化工艺条件及过程  

Technological conditions and process analysis on denitrification of biofilm-electrode system

作　　者：冯玉杰[1] 沈宏[1] 杨靖明[1] 吕江维[1] 陈旭[1] 

机构地区：[1]哈尔滨工业大学城市水资源与水环境国家重点实验室,哈尔滨150090

出　　处：《哈尔滨工业大学学报》2008年第12期1956-1961,共6页Journal of Harbin Institute of Technology

基　　金：国家重点基础研究发展计划项目(973-2004CB41850)

摘　　要：为获得具有良好反硝化性能的电极生物膜,以活性污泥为出发菌株,分别以连续和间歇培养方式在石墨电极上生长电极生物膜,研究碳氮比、电流强度、pH等工艺条件对电极生物膜反硝化过程的影响.结果表明:当碳氮比小于3.0时,体系的反硝化速率与碳氮比成正比;而在3.0以后,反硝化速率的增长开始趋于缓慢;电流强度为20mA时,硝酸盐去除效率达到最大值9.26mg/(L.h),继续加大电流,硝酸盐的去除率降低;当pH等于7时,硝酸盐氮的去除负荷最大,为7.89mg/(g.h),而pH小于或大于7时,生物膜的反硝化性能均有所降低.对单纯电极法、单纯生物膜法和电极生物膜法进行比较研究,证明电极生物膜法对硝酸盐的去除是电与生物膜共同作用的结果.In order to acquire biofilm - electrode with good denitrification ability, biofilm - electrodes were obtained on graphite plates by continuous and batch culture methods with activated sludge, respectively. The influences of C/N ratio, current intensity and pH value on the denitrification process were evaluated. The results indicated that the denitrification rate was in direct proportion to the C/N ratio when the ratio of C/N was less than 3.0, while the increasing rate of denitrification was slowed down when the ratio of C/N was above 3.0. A maximum value of 9.26 rag/（ L · h） for nitrate removal efficiency was gotten when a current intensity of 20 mA was applied. With larger amounts of current density, the nitrate removal efficiency was decreased. A nitrate removal loading of 7.89 mg/（g · h） was obtained when pH was at 7, but the denitrification ability of biofilm - electrodes was decreased with the pH value above or below 7. A comparison of denitrification with methods of electrolysis, biofilm and biofilm - electrode was carried out and a cooperation evidence of electrode process and biofilm was proved.

关 键 词：电极生物膜 硝酸盐氮 反硝化 

分 类 号：X703[环境科学与工程—环境工程]